SACCH

SAR

SB

SB - Synchronisation Burst; used for time synchronisation of the mobile

SCH

SCH - Synchronisation Channel; downlink only frame synchronisation and identification of base station

SCP

SCP - Switching/Service Control Point

SDCCH

SDCCH - Stand-alone Dedicated Control Channel; communications channel between the MS and the BTS. Used for signalling during call set-up before a TCH is allocated

SDLC

SDLC - Synchronous Data Link Control

SDMA

SDMA - Spatial Division Multiple Access

SGSN

SGSN - Serving GPRS Support Node; the gateway between the RNC and the core network in a GPRS/UMTS network

SIM

SIM - Subscriber Identity Module. The smart card used in digital phones. It carries the user's identity for accessing the network and receiving calls and also stores personal infromation, such as phone directory and received SMS messages.

Smartphone

SMR

SMR - Specialised Mobile Radio; the US term for private mobile radio (See PMR)

SMS

SMS - Short Message Service. A service that enables subscribers to send short text messages (usually about 160 characters) to and from mobile phones.

SMS-MO

SMS-MO - SMS Mobile Originated

SMS-MT

SMS-MT - SMS Mobile Terminated

SMS-PP

SMS-PP - SMS Point to Point

SMSC

SMSC - SMS Centre-the network entity which switches SMS traffic

SMSCB

SMSCB - SMS Cell Broadcast

SND

SND - Send; The key on a cellular phone which initiates a call or answers an incoming call

SoHo

SoHo - Small Office/Home Office

SP

SP - Service Provider

Speakerphone

Speakerphone - or Build-in Handsfree. Allows the phone to be used at a short distance, without the phone being held next to the face.

Speed dialling

Speed dialling - See One-touch dialling

SQAM

SQAM - Staggered Quadrature Amplitude Modulation

SQPSK

SQPSK - Staggered Quadrature Phase Shift Keying

SS

SS - Supplementary Service Support; handles special services

SS7

SS7 - Signalling System Number 7 (See CCS7)

SSP

SSP - Service Switching Point

Standby time

Standby time - The length of time a battery can power a mobile phone when it is switched on but not making or receiving calls

STK

STK - SIM ToolKit: specified within the GSM standard, this allows operators to add additional functions to the phone menu in order to provide new services such as mobile banking or email

STM

STM - Synchronous Transfer Mode

STN

STN - Super Twisted Nematic. A type of LCD display technology. STN uses less power and is less costly than TFT technology, but at the expense of image quality and response time.

Streaming

Streaming - An Internet derived expression for the one-way transmission of video and audio content

Symbian

Symbian - A company created by Psion, Nokia, Ericsson and Motorola in 1998 with the aim of developing and standardising an operating system which enable mobile phones from different manufacturers to exchange information. The operating system is known as EPOC. Matsushita has subsequently joined Symbian